I'm getting quite tired of trying to shoot someone only for my bullet to hit an invisible wall and not hit my target, and then my target discovers me and I miss the opportunity for a stealth kill. This is a problem with vanilla fallout and I know theres mods that improve the collision meshes on both fallout 3 and fallout NV.

So I was wondering how to go about getting better collision meshes for TTW. Should I just grab the meshes folder from both, combine them into one (overwrite) and then drag the meshes to my fallout NV data/meshes folder? Or is there a better way to approach this (or any way at all), or should I just forget about it and try to work around the meshes when playing? Anybody have any ideas or solutions?

You could but why? You wouldn't gain anything by doing so, there's no plugins to worry about so the plugin limit isn't a worry. It's just as easy to d/l and install them from Nexus manually or by your manager of choice.